If you are looking to have gravel appear under the water apng, using this method will not work.

Can you give a bit more description of what you are trying to do, visually?It is rather confusing as you have it set up as ice in both name and desc, then you are trying to use the water apng with gravel?

The animation you show (the book) does not use an overlay, it is all done within each frame of the animation

todada wrote:You have to create a base image with same size as the animation.Afaik. there is no easy way to fill an image with a pattern, so you have to combine the static png 16 times.You can try something like: